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In theory, stem cells can grow into replacements for almost any part of your body. If derived from cells taken from you, there’d be no problems with rejection. They’re cells that can develop into many different types of tissue, such as bone, muscle or brain. There are three basic types. “Totipotent” stem cells—the cells formed when a fertilised egg first divides—can turn into any type of tissue and form a “total” organism. About five days after fertilisation,